Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f82e723d387df2…

MALICIOUS

PDF

92.3 KB Created: 2021-07-28 03:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25bf9b4487dc2b361e6c776a7bf5d677 SHA-1: e0a330b640f7d6d06f7a99cb3528f1c876f127f4 SHA-256: 91f82e723d387df28fb11a1b710aa919642015a79ac2d4d348f0061e28558d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://andana.us/files/files/zutoduzirekowawov.pdf
    • http://aggengr.com/uploads/CMS/file/25778917598.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/lekevapabatenalawok.pdf
    • https://pet-fashion.ro/mm/file/guwapugo.pdf
    • http://gachbinhduong.com/upload/file/detoja.pdf
    • http://www.herbertvanderbrugghen.nl/draft/13452094044.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/27878963979.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b82980e2974---7895196949.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c5317243dce9d7aeb16c9082ad8d94f7/42192828675.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9a966c2dgjtdai16s6gshovp45/zowetowiw.pdf
    • http://patokapugsnkisses.com/clients/61143/File/firapetatof.pdf
    • http://chickendaylacrescenta.com/uploads/files/bibukunovolefemolefi.pdf
    • http://collegium-connect.nl/ckupload/files/tokuzoxiwises.pdf
    • http://heydarbaba.org/resimler/files/89058834249.pdf
    • http://lab4050.com/upload/editor/file/63899298693.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee344c3cddb---49584499692.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21b46ec11---fadutumitom.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/gub8qdkun3e79u3q220l2df82k/12019680694.pdf
    • http://nensi.si/upload/file/pabezo.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0dde479f---zalufokago.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kicking+away+the+ladder+summary+pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/90480302315.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fd2fe50f84889d62d178262fdd33ff12/bawade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010192.bin
e62b311cfdcf1e1ebc18b20e75b3036210debe57740e5c285bc776d6a117dd34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 17396 bytes
font_01_sfnt_off00012e81.bin
4727cfb6da37c643260a7783bb589535b7e70b010898928cf0220ecd933e10e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 11332 bytes
font_02_sfnt_off000148d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148D8 16792 bytes